Dental carving machine



July 9, R935 H 5P|RQ 2,@U7,%

' DENTAL GARVING MACHINE Filed Sept. 25, 1935 5 Sheets-Sheet l Jufly Q,W35. H. SPIRO fi fi DENTAL CARVING' MACHINE Filed Sept. 25, 1955 sSheets-Sheet 2 Patented July 9, 1935 STAT-es I DENTAL' CARVING MAoniNEHarry Spiro, Chicago; 111-,

Research Corporation,

assignor to Dental ph cago, 111., acorpora- Application September25,1933, serial No; (i9l),908

it is frequently necessary or desirable to carve or chisel certainparts. One of thefeatures of my invention is the provision of such amachine by which parallel surfaces may be readily made.

My invention 1's particularly applicable in con 7 nection with themaking of bridges as disclosed in my co-pending application, Serial "No.632,203, filed September 8, 1932. In that application I disclosed amethod of mounting bridges by the use of adapters on the abutinentteeth. In the practice of that process it is necessary or desirable" toprovide said adapters with parallel surfaces. This can be accomplishedvery readily bythe use of the carving machine herein dis closed.

Another feature of my invention is'the provisio-n of means for fasteninga cast on a universally mounted support where the same is at: cessibleby the carving too-1s. I i i Another feature it of my invention is theprovision of an improveddowel adapted to be imbeddecl in a castto permitthe same to be removably supported on the work support.

Other features and advantages of my invention will appear more fully asI proceed with my specification. i

In that form of device embodying the features of my invention shown inthe accompanying drawings- Figure 1 is a view in side elevation; Fig. 2is a view in front elevation; Fig. 3 is a view similar to Fig. 1; Fig. 4is a vertical sectional View through one of the tool carriers; Fig. 5 isa similar view through the other tool carrier; Fig. 6 is a view taken asindicated by the line 6 of. Fig. 5; Fig. 7 is a top plan View of a platefor mounting the dowel pins in the cast; Fig. 8 is a view taken asindicated by the line 8 of Fig. '7; Fig. 9 is an end View of the plateof Fig. 7; Fig. 10 is a vertical sectional view through the worksupport; and Fig. 11 is a top plan view of the work support.

As shown-in the drawings, the device includes a platform ill, a post I lmounted on the platform and a horizontal arnr I2 carried by the post.

it indicates a universally mounted work sup port with a base H! adaptedto be slidably posiworm 39.

work support carving tool l5 and the arm I? carries a verticallyreciprocable carving tool Hi.

I For the purpose of mounting a cast (for examplaa ctistll as shown inFig. 8) on the work support I3,sa id cast is rovided with'two dowels 18,I8 spaced a predetermined distance apart. This is accomplished byprovidinga temporary supporting plate is (Fig. '7) upon which the castI! is made. dowel pins 3 are positioned in this plate and the castformed onthe same, .as shown in Fig. 8. The lower ends of the-'pinsarejprovided with annular grooves it adaptedto be engaged by keyhole slots2i] in the slide-2| in the plate l9. The upper ends of the dowels 18 areprovided With annular recesses I8 to iormlocks with the plaster cast-ll.The dowels I8 are positioned in the plate l9 and lockedwithihe slide 2 Iand the cast is then formed on the plate. The slide 2| is then movedto-release the lower ends of the dowels, whereupon the cast can beremoved with the dowels remaimng therein. The work support is (see Figzllliis provided with two holes 22, 22 also spaced the same-distanceapart as the holes carrying the dowelsin the plate is. This work supportI3 is also provided with a slide 23 having keyhole slots 24 similar tothe slide 2i with its keyhole slots. Consequently, after the cast ll hasbeen formed with the dowels It in place, it can be positioned on thework support l3 by placing the dowels in the holes 22 and locked thereonby movement of the slide 23 to cause the keyhole slots 24 to engage thegrooves l8= in the lower ends of the dowels. In this way the cast can bereleasably locked or positioned on the work support l3.

The universal mounting of the work support l3 on the base I4 isaccomplished in the following manner. The base i4 is provided with abifurcated support 30 having a horizontal pivot pin 3| carrying a wormgear 32. A worm 33 is provided for rotating the gear 32. This worm 33may have an operating handle micrometerscrew 35 may be provided to showthe degree of rotation. The upper portion of the wheel 32 carries abifurcated support 3% with a pivot pin 31. A gear 38 is mounted on thebifurcated member 36 and is engaged by the ends of a bifurcated support40 which carries the work support l3. The axes of the pivot pins 3| and31 are both horizontal and at right angles 34 and a The pivot pin alsocarries the lower to each other. The worm 39 is adapted to be operatedby the handle 46 and a micrometer screw 41 may be provided to show thedegree of rotation. By operating the handles 34 and 46, either of theworms 33 and 39 may be turned in order to give any inclination desiredto the work support l3.

The carving tool I5 is reciprocably carried in a sleeve 66 Reciprocationmay be imparted to the same by an operating handle 6l'on the end of aspline shaft 62 extending through a worm 63. 64 indicates a gearengaging the worm 63. This gear is on a shaft 65 which also carries agear 66 engaging the rack 61 on the post H. The shaft 65 is mounted on acarriage 65 which is vertically movable on the post. By thisconstruction, rotation of the handle 6| will rotate the worm 63 to raiseor lower the tool I5. This,

however, will not interfere with the reciprocation of the tool. Thespline in the shaft 62 engages a screw 68 on the worm 63 to impartrotation to the same, the spline permitting horizontal reciprocations ofthe shaft 62 through the worm. The inner end of the shaft 62 is providedwith an annular recess 10 engaged by a screw H on the end of the shaft'12 inside of the sleeve 66. The shaft 12 is preferably square toprevent rotation of the same in the sleeve. It will be seen, therefore,that the shaft 62 can be used to reciprocate the shaft 12 in the sleeve60 and that the annular recess 16 will permit rotation of the shaft 62to rotate the worm 63 to raise or lower the tool, as desired.

The tool I6 is mounted for vertical reciprocation in the arm l2. Thistool I6 is carried on the lower end of the shaft 86 which is providedwith an adjustable stop 8| to limit the downward movement of the same.Therlower end of the shaft is also preferably provided with a notch 82adapted to be engaged by a springpressed ball 83 to yieldingly'hold thetool in its uppermost position out of the way. In orderto. permitvertical adjustment of the stop ,8], the same is made in the form of asleeve threaded on the inner sleeve 96 which is mounted'on the shaft 80by means of the set screw 9|, a plurality of indentations 92 beingprovided for engagement by the inner end of the screw 9|.

In the operation of the apparatus, the cast is made on a temporarysupporting plate l9 and the dowels l8 correctly positioned therein. Thecast may then be supported on the work support I3, the base of whichrests on the platform ID. The desired angle of the work support may thenbe obtained and by use of the tools l5 and I6, parallel surfaces asdesired may be cut on the cast, or any part thereof.

While I have shown and described certain embodiments of my invention, itis to be understood that it is capable of many modifications. Changes,therefore, in the construction and arrangement may be made withoutdeparting from the spirit and scope of the invention as disclosed in theappended claims, in which it is my intention to claim all noveltyinherent in my invention as broadly as permissible, in view of the priorart.

What I regard as new, and desire to secure by Letters Patent, is:

l. A dental carving machine, including; a platform; a post on theplatform; a horizontally reciprocable carving tool mounted on the post,said tool being also vertically adjustable on the post; a handle forhorizontally reciprocating the tool; and means whereby rotation of saidhandle will vertically adjust the same on the post.

2. Apparatus as claimed in claim 1., in which the vertical adjustment ofthe tool is effected through a rack bar carried by the post and engagedby a gear connected to the tool, said gear being rotated by rotation ofsaid handle.

3. A dental carving machine, including; a platform; a post on theplatform; a vertically movable carriage on the post; a horizontallyreciprocable carving tool mounted on the carriage; a handle forhorizontally reciprocating the tool with respect to the carriage; andmeans whereby rotation of said handle will vertically adjust thecarriage.

4. Apparatus as claimed in claim 3, in which the vertical adjustment ofthe carriage is effected through a rack bar carried by the post andengaged by a gear mounted on the carriage, said gear being rotated byrotation of said handle.

HARRY SPIRO.

